High-pressure fuel pump for an internal combustion engine

Abstract

The invention relates to a high-pressure fuel pump for an internal combustion engine with direct injection, comprising a pump housing, a low-pressure region on the intake side, and a high-pressure region on the output side. The high-pressure fuel pump comprises a purely mechanical pressure regulating device for regulating a constant pressure in the high-pressure region.

1 - 10 . (canceled) 
     
     
         11 . A high-pressure fuel pump for an internal combustion engine with direct injection, having:
 a pump housing;   a low-pressure region on an inlet side of the hi-pressure fuel pump;   a high-pressure region on an outlet side of the hi-pressure fuel pump; and   a purely mechanical pressure regulating device for regulating a constant pressure in the high-pressure region.   
     
     
         12 . The high-pressure fuel pump as defined by  claim 11 , wherein the mechanical pressure regulating device includes a mechanical pressure regulating valve, in particular a mechanical check valve. 
     
     
         13 . The high-pressure fuel pump as defined by  claim 11 , wherein a throttle restriction is disposed upstream of a valve element of the pressure regulating device. 
     
     
         14 . The high-pressure fuel pump as defined by  claim 12 , wherein a throttle restriction is disposed upstream of a valve element of the pressure regulating device. 
     
     
         15 . The high-pressure fuel pump as defined by  claim 13 , wherein the throttle restriction is embodied in a valve seat housing of the pressure regulating valve and/or in a receiving opening in the pump housing for the pressure regulating device and/or in an inflow conduit to the pressure regulating device. 
     
     
         16 . The high-pressure fuel pump as defined by  claim 14 , wherein the throttle restriction is embodied in a valve seat housing of the pressure regulating valve and/or in a receiving opening in the pump housing for the pressure regulating device and/or in an inflow conduit to the pressure regulating device. 
     
     
         17 . The high-pressure fuel pump as defined by  claim 11 , wherein that the pressure regulating device is disposed in the cylindrical pump housing, in a bore disposed offset from a longitudinal axis of the pump housing. 
     
     
         18 . The high-pressure fuel pump as defined by  claim 12 , wherein that the pressure regulating device is disposed in the cylindrical pump housing, in a bore disposed offset from a longitudinal axis of the pump housing. 
     
     
         19 . The high-pressure fuel pump as defined by  claim 13 , wherein that the pressure regulating device is disposed in the cylindrical pump housing, in a bore disposed offset from a longitudinal axis of the pump housing. 
     
     
         20 . The high-pressure fuel pump as defined by  claim 15 , wherein that the pressure regulating device is disposed in the cylindrical pump housing, in a bore disposed offset from a longitudinal axis of the pump housing. 
     
     
         21 . The high-pressure fuel pump as defined by  claim 11 , further having a connecting bore of the pressure regulating device extending transversely to a longitudinal axis of the pump housing, the connecting bore being disposed between the pressure regulating device and the high-pressure region. 
     
     
         22 . The high-pressure fuel pump as defined by  claim 20 , further having a connecting bore of the pressure regulating device extending transversely to a longitudinal axis of the pump housing, the connecting bore being disposed between the pressure regulating device and the high-pressure region 
     
     
         23 . The high-pressure fuel pump as defined by  claim 13 , wherein the pressure regulating device has a valve spring and/or a sealing diameter between the valve element and a valve seat, by which a limit pressure in the high-pressure region is defined. 
     
     
         24 . The high-pressure fuel pump as defined by  claim 20 , wherein the pressure regulating device has a valve spring and/or a sealing diameter between the valve element and a valve seat, by which a limit pressure in the high-pressure region is defined. 
     
     
         25 . The high-pressure fuel pump as defined by  claim 11 , wherein the pressure regulating device has a cartridgelike valve housing, which is inserted, preferably press-fitted, into a receiving opening of the pump housing. 
     
     
         26 . The high-pressure fuel pump as defined by  claim 24 , wherein the pressure regulating device has a cartridgelike valve housing, which is inserted, preferably press-fitted, into a receiving opening of the pump housing. 
     
     
         27 . The high-pressure fuel pump as defined by  claim 11 , wherein an inlet valve is disposed coaxially to a pump piston of the high-pressure fuel pump. 
     
     
         28 . The high-pressure fuel pump as defined by  claim 26 , wherein an inlet valve is disposed coaxially to a pump piston of the high-pressure fuel pump. 
     
     
         29 . The high-pressure fuel pump as defined by  claim 11 , wherein an outlet of the pressure regulating device communicates with the low-pressure region of the high-pressure fuel pump, in particular with a receiving chamber of a pressure damper. 
     
     
         30 . The high-pressure fuel pump as defined by  claim 28 , wherein an outlet of the pressure regulating device communicates with the low-pressure region of the high-pressure fuel pump, in particular with a receiving chamber of a pressure damper.